US 12,262,839 B2
Machine for preparing coffee
Paolo Evangelisti, Treviso (IT); and Nicola Piovan, Treviso (IT)
Assigned to De' Longhi Appliances S.R.L. Con Unico Socio, Treviso (IT)
Appl. No. 17/604,788
Filed by DE' LONGHI APPLIANCES S.R.L. CON UNICO SOCIO, Treviso (IT)
PCT Filed Apr. 16, 2020, PCT No. PCT/IT2020/050096
§ 371(c)(1), (2) Date Oct. 19, 2021,
PCT Pub. No. WO2020/213018, PCT Pub. Date Oct. 22, 2020.
Claims priority of application No. 102019000006192 (IT), filed on Apr. 19, 2019.
Prior Publication US 2022/0175177 A1, Jun. 9, 2022
Int. Cl. A47J 31/36 (2006.01); A47J 31/46 (2006.01)
CPC A47J 31/3619 (2013.01) [A47J 31/469 (2018.08)] 12 Claims
OG exemplary drawing
 
1. Automatic machine for preparing beverages, in particular American coffee, comprising:
a unit to feed the coffee powder,
a mobile infusion unit comprising an infusion cylinder which delimits an infusion chamber, and
a hydraulic circuit configured to heat the water for the infusion and feed the water to the infusion chamber,
wherein said infusion unit comprises an expulsion piston slidable inside the infusion cylinder and delimiting at a lower part said infusion chamber, and a valve device provided with a valve body and a closing piston which can engage with the infusion cylinder in order to close said infusion chamber,
wherein said infusion chamber is associated with a first feed pipe for the infusion water connected to said hydraulic circuit and with an exit pipe, which extends from a side opposite said first feed pipe, and configured to take to the exit of said infusion chamber both a coffee beverage obtained by infusion of said coffee powder, and also residual water obtained by means of a compression of used coffee powder between said expulsion piston and said closing piston,
the automatic machine further comprising a deflection valve which can be selectively activated to put said exit pipe in communication with a delivery pipe configured to deliver the infused beverage into a receptacle of a user, or with a discharge pipe configured to discharge the residual water deriving from a drying of the used coffee powder.